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Tilt table test
A tilt table test, occasionally called upright tilt testing, is a medical procedure often used to diagnose dysautonomia or syncope. Patients with symptoms of dizziness or lightheadedness, with or without a loss of consciousness (fainting), suspected to be associated with a drop in blood pressure or positional tachycardia are good candidates for this test.
The procedure tests for causes of syncope by attempting to cause syncope by having the patient lie flat on a special table or bed and then be monitored with ECG and a blood pressure monitor which measure continuous, beat to beat, non-invasively. The table then creates a change in posture from lying to standing.
==Preparations==
Before taking the test, the patient may be instructed to fast for a period before the test will take place and to stop taking any medications. On the day of the tilt table test, an intravenous line may be placed in case the patient needs to be given medications quickly; however, this may influence the results of the test and may only be indicated in particular circumstances. More recently, most investigators monitor cerebral perfusion using mean flow velocity recording with transcranial Doppler ultrasound in supine horizontal position, during and after head-up tilt. An 18 MHz ultrasound transducer is placed on the temporal bone above the cheekbone, using headgear to hold the probe in place.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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